public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
SyntaxNode root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);
BinaryExpressionSyntax binaryExpression = root
.FindNode(context.Span, getInnermostNodeForTie: true)?
.FirstAncestorOrSelf <BinaryExpressionSyntax>();
if (binaryExpression == null)
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case DiagnosticIdentifiers.SimplifyBooleanComparison:
{
CodeAction codeAction = CodeAction.Create(
"Simplify boolean comparison",
cancellationToken => SimplifyBooleanComparisonRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseAnyMethodInsteadOfCountMethod:
{
CodeAction codeAction = CodeAction.Create(
"Call 'Any' instead of 'Count'",
cancellationToken => UseAnyMethodInsteadOfCountMethodRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.AvoidNullLiteralExpressionOnLeftSideOfBinaryExpression:
{
CodeAction codeAction = CodeAction.Create(
$"Swap '{binaryExpression.Left}' and '{binaryExpression.Right}'",
cancellationToken => SwapExpressionsInBinaryExpressionRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseStringIsNullOrEmptyMethod:
{
CodeAction codeAction = CodeAction.Create(
"Use 'string.IsNullOrEmpty' method",
cancellationToken => UseStringIsNullOrEmptyMethodRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.SimplifyCoalesceExpression:
{
ExpressionSyntax expression = binaryExpression.Left;
if (expression == null ||
!context.Span.Contains(expression.Span))
{
expression = binaryExpression.Right;
}
CodeAction codeAction = CodeAction.Create(
"Simplify coalesce expression",
cancellationToken => SimplifyCoalesceExpressionRefactoring.RefactorAsync(context.Document, binaryExpression, expression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.RemoveRedundantAsOperator:
{
CodeAction codeAction = CodeAction.Create(
"Remove redundant 'as' operator",
cancellationToken => RemoveRedundantAsOperatorRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseConditionalAccess:
{
CodeAction codeAction = CodeAction.Create(
"Use conditional access",
cancellationToken => UseConditionalAccessRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseStringLengthInsteadOfComparisonWithEmptyString:
{
CodeAction codeAction = CodeAction.Create(
"Use string.Length",
cancellationToken => UseStringLengthInsteadOfComparisonWithEmptyStringRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
}
}
}
public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
{
SyntaxNode root = await context.GetSyntaxRootAsync().ConfigureAwait(false);
BinaryExpressionSyntax binaryExpression = root
.FindNode(context.Span, getInnermostNodeForTie: true)?
.FirstAncestorOrSelf <BinaryExpressionSyntax>();
if (binaryExpression == null)
{
return;
}
foreach (Diagnostic diagnostic in context.Diagnostics)
{
switch (diagnostic.Id)
{
case DiagnosticIdentifiers.SimplifyBooleanComparison:
{
CodeAction codeAction = CodeAction.Create(
"Simplify boolean comparison",
cancellationToken => SimplifyBooleanComparisonRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseAnyMethodInsteadOfCountMethod:
{
CodeAction codeAction = CodeAction.Create(
"Call 'Any' instead of 'Count'",
cancellationToken => UseAnyMethodInsteadOfCountMethodRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.AvoidNullLiteralExpressionOnLeftSideOfBinaryExpression:
{
CodeAction codeAction = CodeAction.Create(
$"Swap '{binaryExpression.Left}' and '{binaryExpression.Right}'",
cancellationToken => SwapExpressionsInBinaryExpressionRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseStringIsNullOrEmptyMethod:
{
CodeAction codeAction = CodeAction.Create(
"Use 'string.IsNullOrEmpty' method",
cancellationToken => UseStringIsNullOrEmptyMethodRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.SimplifyCoalesceExpression:
{
ExpressionSyntax expression = binaryExpression.Left;
if (expression == null ||
!context.Span.Contains(expression.Span))
{
expression = binaryExpression.Right;
}
CodeAction codeAction = CodeAction.Create(
"Simplify coalesce expression",
cancellationToken => SimplifyCoalesceExpressionRefactoring.RefactorAsync(context.Document, binaryExpression, expression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.RemoveRedundantAsOperator:
{
CodeAction codeAction = CodeAction.Create(
"Remove redundant 'as' operator",
cancellationToken => RemoveRedundantAsOperatorRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseStringLengthInsteadOfComparisonWithEmptyString:
{
CodeAction codeAction = CodeAction.Create(
"Use string.Length",
cancellationToken => UseStringLengthInsteadOfComparisonWithEmptyStringRefactoring.RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UnconstrainedTypeParameterCheckedForNull:
{
SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);
ITypeSymbol typeSymbol = semanticModel.GetTypeSymbol(binaryExpression.Left, context.CancellationToken);
CodeAction codeAction = CodeAction.Create(
$"Use EqualityComparer<{typeSymbol.Name}>.Default",
cancellationToken => UnconstrainedTypeParameterCheckedForNullRefactoring.RefactorAsync(context.Document, binaryExpression, typeSymbol, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.ValueTypeCheckedForNull:
{
SemanticModel semanticModel = await context.GetSemanticModelAsync().ConfigureAwait(false);
ITypeSymbol typeSymbol = semanticModel.GetTypeSymbol(binaryExpression.Left, context.CancellationToken);
string title = null;
if (typeSymbol.IsPredefinedValueType() ||
typeSymbol.ExistsMethod(WellKnownMemberNames.EqualityOperatorName))
{
ExpressionSyntax expression = typeSymbol.ToDefaultValueSyntax(semanticModel, binaryExpression.Right.SpanStart);
title = $"Replace 'null' with '{expression}'";
}
else
{
title = $"Use EqualityComparer<{SymbolDisplay.GetMinimalString(typeSymbol, semanticModel, binaryExpression.Right.SpanStart)}>.Default";
}
CodeAction codeAction = CodeAction.Create(
title,
cancellationToken => ValueTypeCheckedForNullRefactoring.RefactorAsync(context.Document, binaryExpression, typeSymbol, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
case DiagnosticIdentifiers.UseIsOperatorInsteadOfAsOperator:
{
CodeAction codeAction = CodeAction.Create(
"Use is operator",
cancellationToken => UseIsOperatorInsteadOfAsOperatorRefactoring.
RefactorAsync(context.Document, binaryExpression, cancellationToken),
diagnostic.Id + EquivalenceKeySuffix);
context.RegisterCodeFix(codeAction, diagnostic);
break;
}
}
}
}
